Hey guys, hoping I can find some wisdom, because I am completely lost. I have a '96, 320,000 miles. Purchased a year ago, haven't had any major issues till now. About a month ago we hit a cold snap, I was out of town on a business trip. Came home after a week, and the truck wouldn't start. Thought it would be a simple fix... And that was almost a month ago. First I started with the fuel system. Thought maybe fuel had gelled, so I did the Diesel 911 trick. After that, I was thinking maybe sediment in the fuel system. Pulled the fuel bowl, there was a little sediment in the bottom. But filter looked good, so I swapped the filters, cleaned the bowl, and reinstalled. Then I checked the metal lines coming out of the mechanical pump in the valley, and they appeared to be pumping fuel out, so no apparent clogs. Next I tried starting in neutral to see if it was the park sensor. After this, I replaced the black CPS with a grey. Still no luck. Took me a little while, but I got the Auto Enginuity scanner to run a buzz test. It failed, after buzzing all 8 fine, so I was told it would be the IDM. Got a replacement today, installed and retested. It finished the test, but said there was low voltage on cylinder 5. Plugged the truck in to warm up the block for about 3 hrs, since it was 25° outside. Then I tried to start it again, and still no luck. I can turn the engine over with the starter all day long, but it will not catch at all. After cranking for several minutes, I still smell no diesel fumes coming out the exhaust, which makes me think it's still some sort of fuel issue. This truck is stock. Only mod is a Hyperteck chip, which I went through and reprogrammed to make sure it hadn't defaulted to some weird setting. What am I missing??